How Can I Reliably Detect Internet Connectivity Changes in My Android App Using Broadcast Receivers?

Broadcast Receiver for Checking Internet Connection in Android App

In Android applications, broadcast receivers are employed to monitor changes in the system or specific events. One such common use case is checking for internet connectivity. However, in certain scenarios, it may be desirable to restrict the receiver's invocation to instances where a network connection is available.

Problem: Duplicate Broadcast Receiver Invocations

A common challenge encountered is that the receiver gets called twice, even though the network may be unavailable. This can be attributed to the addition of multiple intent filters in the receiver's manifest declaration. To resolve this issue, it is sufficient to use only one action for network connectivity changes, such as:

<intent-filter>
    <action android:name="android.net.conn.CONNECTIVITY_CHANGE"></action>
</intent-filter>

Checking for Internet Availability

To address the second concern, where the receiver should only trigger when a network connection is available, the provided code effectively fulfills this requirement. It monitors both WiFi and mobile network availability and only notifies if either of them is connected.

Additional Note

For a simpler approach to verifying internet connectivity, consider the following function:

public boolean isOnline(Context context) {

    ConnectivityManager cm = (ConnectivityManager) context.getSystemService(Context.CONNECTIVITY_SERVICE);
    NetworkInfo netInfo = cm.getActiveNetworkInfo();
    //should check for null as it will be null in airplane mode
    return (netInfo != null && netInfo.isConnected());
}

This method provides a concise way to determine if a mobile device is connected to a network.

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